SN74ALS644A-1DW

Buffers, Drivers, Receivers, Transceivers Overview

The SN74ALS644A-1DW is an eight-bit bus transceiver from Texas Instruments' Advanced Low-power Schottky (ALS) logic series. It features true outputs and operates within a standard TTL voltage range. The device supports bidirectional data transfer between two buses, controlled by direction and output enable inputs. Packaged in a 20-pin plastic small outline (DW), it is designed for commercial temperature applications, offering high-speed performance with low power consumption typical of the ALS family.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Eight-bit bidirectional bus transceiver architecture
• Advanced Low-power Schottky (ALS) logic technology
• True output configuration for direct signal transmission

Buffers, Drivers, Receivers, Transceivers Applications

• Memory module data bus interfacing
• Microprocessor system address and data lines
• Control signal distribution networks

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix '-1DW' confirms the commercial temperature grade and 20-pin SOIC package. Ensure compatibility with existing 5V TTL logic levels on the target board. Confirm that the manufacturer designation matches Texas Instruments specifications for the ALS series to avoid counterfeit components.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when an eight-bit wide bidirectional interface is required with moderate speed and low power dissipation. The ALS series provides a balance between speed and power, suitable for systems where propagation delay is critical but power budget is constrained compared to standard LS logic.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the Texas Instruments 74ALS logic family, which improves upon the standard 74LS series with faster switching speeds and lower power usage. The SN74ALS644A variant specifically addresses multi-bit data path requirements, serving as a fundamental building block for digital system interconnects.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

Direct substitutes include other 8-bit ALS bus transceivers such as the SN74ALS245 or SN74ALS646, provided pinout and electrical characteristics match. Verify that alternative parts maintain the same commercial temperature rating and package dimensions for mechanical compatibility.